From 9aa88ae0d7d4acb2131d028988309ff6d826529d Mon Sep 17 00:00:00 2001
From: Andre Klapper <a9016009@gmx.de>
Date: Thu, 8 Jun 2023 14:50:24 +0200
Subject: [PATCH] Fix PHP 8.1 "strlen(null)" exception on History page of
 Diffusion repo after renaming default branch

Summary:
`strlen()` was used in Phabricator to check if a generic value is a non-empty string.
This behavior is deprecated since PHP 8.1. Phorge adopts `phutil_nonempty_string()` as a replacement.

Note: this may highlight other absurd input values that might be worth correcting
instead of just ignoring. If phutil_nonempty_string() throws an exception in your
instance, report it to Phorge to evaluate and fix that specific corner case.

```
EXCEPTION: (RuntimeException) strlen(): Passing null to parameter #1 ($string) of type string is deprecated at [<arcanist>/src/error/PhutilErrorHandler.php:261]
arcanist(head=arcpatch-D25250, ref.master=18554ea76ceb, ref.arcpatch-D25250=fade4603a799), phorge(head=master, ref.master=e11c5486c92b)
  #0 <#2> PhutilErrorHandler::handleError(integer, string, string, integer) called at [<phorge>/src/applications/repository/xaction/PhabricatorRepositoryDefaultBranchTransaction.php:25]
```

Closes T15434

Test Plan: After applying this change, after changing the name of the (previously empty) default branch of a Diffusion repository, and then going to the repository History at `/diffusion/<someID>/manage/history/`, the page renders correctly in the web browser instead of showing an exception.

Reviewers: O1 Blessed Committers, speck

Reviewed By: O1 Blessed Committers, speck

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15434

Differential Revision: https://we.phorge.it/D25265
---
 .../xaction/PhabricatorRepositoryDefaultBranchTransaction.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/applications/repository/xaction/PhabricatorRepositoryDefaultBranchTransaction.php b/src/applications/repository/xaction/PhabricatorRepositoryDefaultBranchTransaction.php
index 23eebf60c8..949e394b91 100644
--- a/src/applications/repository/xaction/PhabricatorRepositoryDefaultBranchTransaction.php
+++ b/src/applications/repository/xaction/PhabricatorRepositoryDefaultBranchTransaction.php
@@ -17,12 +17,12 @@ final class PhabricatorRepositoryDefaultBranchTransaction
     $old = $this->getOldValue();
     $new = $this->getNewValue();
 
-    if (!strlen($new)) {
+    if (!phutil_nonempty_string($new)) {
       return pht(
         '%s removed %s as the default branch.',
         $this->renderAuthor(),
         $this->renderOldValue());
-    } else if (!strlen($old)) {
+    } else if (!phutil_nonempty_string($old)) {
       return pht(
         '%s set the default branch to %s.',
         $this->renderAuthor(),